Time in Sumy vs Guangzhou
Sumy keeps EEST (UTC+3) and Guangzhou keeps CST (UTC+8) today. Guangzhou is 5 hours ahead of Sumy; the rows below read both clocks live.
The working day, side by side
Hours shaded in both rows are inside working hours in both cities: 14:00–18:00 in Guangzhou (09:00–13:00 your time).
| City | 00:00 in Sumy | 01:00 in Sumy | 02:00 in Sumy | 03:00 in Sumy | 04:00 in Sumy | 05:00 in Sumy | 06:00 in Sumy | 07:00 in Sumy | 08:00 in Sumy | 09:00 in Sumy | 10:00 in Sumy | 11:00 in Sumy | 12:00 in Sumy | 13:00 in Sumy | 14:00 in Sumy | 15:00 in Sumy | 16:00 in Sumy | 17:00 in Sumy | 18:00 in Sumy | 19:00 in Sumy | 20:00 in Sumy | 21:00 in Sumy | 22:00 in Sumy | 23:00 in Sumy |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sumy—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Guangzhou—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
- Working hours
- Shoulder
- Night
- Overlap
Do more with Sumy and Guangzhou
Best hours to call
Where daylight saving pulls them apart
Sumy next changes on Sunday 25 October 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.
Also useful
Common questions
How many hours ahead is Guangzhou of Sumy?
Guangzhou is 5 hours ahead of Sumy right now. The gap is not fixed: it moves whenever either side changes its clocks.
What is the best time to call between Sumy and Guangzhou?
Any hour in 09:00–13:00 Sumy time is inside working hours in both cities.
Do Sumy and Guangzhou change clocks on the same date?
Only one of them does, so the gap between them changes twice a year even though neither city moved relative to the sun.